Duncan, IA Historical Language Spoken at Home Data
ACS 2010-2014 data
Total population: 113
| Duncan, IA | % | Iowa | U.S. | |
| English | 24 | 100.00%, see rank | 92.20% | 79.39% |
| Spanish | 0 | 0.00%, see rank | 3.98% | 11.75% |
| Other Indo-European Languages | 0 | 0.00%, see rank | 1.97% | 4.52% |
| Asian and Pacific Islander Languages | 0 | 0.00%, see rank | 1.36% | 3.36% |
| Other | 0 | 0.00%, see rank | 0.50% | 0.99% |
ACS 2008-2012 data
Total population: 104
| Duncan, IA | % | Iowa | U.S. | |
| English | 33 | 100.00%, see rank | 92.29% | 79.64% |
| Spanish | 0 | 0.00%, see rank | 4.07% | 11.57% |
| Other Indo-European Languages | 0 | 0.00%, see rank | 2.03% | 4.61% |
| Asian and Pacific Islander Languages | 0 | 0.00%, see rank | 1.21% | 3.24% |
| Other | 0 | 0.00%, see rank | 0.41% | 0.94% |
ACS 2006-2010 data
Total population: 69
| Duncan, IA | % | Iowa | U.S. | |
| English | 38 | 100.00%, see rank | 92.46% | 79.95% |
| Spanish | 0 | 0.00%, see rank | 3.99% | 11.42% |
| Other Indo-European Languages | 0 | 0.00%, see rank | 2.04% | 4.60% |
| Asian and Pacific Islander Languages | 0 | 0.00%, see rank | 1.15% | 3.14% |
| Other | 0 | 0.00%, see rank | 0.36% | 0.89% |
* ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.